wrong fuel?? 
  got a different car this weekend, and, after filling up, guy tells me it only takes super unleaded!! Bit late, its got a tank of normal!
 
 Now, I pretty sure (read hopeful!!) that a tank of this wont do it toooo much damage, if any at all, but could do with some reassurance.  He reckons engine damage is a defo, I disagree.
 
 So, any potential problems with this??